4 Bible Verses about Changed Heart

So if any one is in Christ, he is a new creature: old things have passed away; behold, they have become new.

But he is a Jew, who is one inwardly; and circumcision is that of the heart, in the spirit, not in the letter; whose praise is not of men, but of God.

For a godly sorrow works repentance unto salvation not to be regretted; but the sorrow of the world works out death.

and he not fashioned after this world: but be ye transformed by the renewing of your mind, that you may prove what is the good and acceptable and perfect will of God.